Marcel Duchamp, Rotary Glass Plates [Precision Optics] (formerly Revolving Glass Machine), 1920 Painted glass and iron with electric motor 65 1/4 x 62 x 38 inch

Marcel Duchamp, Rotary Glass Plates [Precision Optics] (formerly Revolving Glass Machine), 1920 Painted glass and iron with electric motor 65 1/4 x 62 x 38 inches Collection of Yale University Art Gallery, Gift of Collection Société Anonyme